What 8 Reales Was Most Typically Used In The Colonies?

The most common 8 Reale coins that appear to have been used contemporarily by developing countries and colonies around the World are those of Carolus 111 and Carolus 1V.
As a personal opinion, I find their coin effigies to be rather ugly.

As such, Spanish colonial coins of this era were more commonly used than those of any other major Power.

Such coins can take their place in a collection that illustrates the history of development of early coinage of many countries, including the United States.

In the case of the United States, they do not necessarily have to be counter marked.

Spanish dollars were made legal tender in the United States by an Act of February 9, 1793, and were not demonetized until February 21, 1857. Testaments to the importance of these coins continue in that "two bits," "pieces of eight" and "picayune" have become part of the American vocabulary. Also, it is interesting to observe that when the New York Stock Exchange opened in 1792 rates were reported in terms of New York shillings which were valued at eight to the Spanish milled dollar, hence changes were reported in eighths. Amazingly, over two hundred years after adoption of the decimal system, stock and security price variations are still reported in eighths!

From the February 9, 1793 Act (sourced to the History of The US Mint Website) :
"the gold coins of France, Spain and the dominions of Spain, of their present standard, at the rate of one hundred cents for every twenty-seven grains and two-fifths of a grain, of the actual weight thereof. Spanish milled dollars, at the rate of one hundred cents for each dollar, the actual weight whereof shall not be less than seventeen pennyweights and seven grains; and in proportion for the parts of a dollar."